# ERLUS Profi vs OBIS

ERLUS Profi and OBIS are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ERLUS Profi ships an update every 4 months, OBIS every 3 months. The most recent releases landed on November 1, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | ERLUS Profi | OBIS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 26 MB | 2 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ERLUS AG](https://appshunter.io/developer/1113943917) | [wissenswerft GmbH](https://appshunter.io/developer/516502110) |

## What reviewers say

### ERLUS Profi

[App page](https://appshunter.io/ios/app/erlus-profi-app-dach/id952643496)

This tool assists professional roofers by allowing them to create and manage construction projects, select roofing tiles, and perform precise calculations for wind load, snow protection, and material quantities. It guides users through data input and offers PDF exports for project summaries and product details.

**Highlights:** Create and manage construction projects, Select appropriate roofing tiles, Calculate material quantities, Determine wind load safety, Calculate snow protection systems, Export project summaries as PDF

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### OBIS

[App page](https://appshunter.io/ios/app/obis/id1349700954)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ERLUS Profi free?

ERLUS Profi is free to download, with no in-app purchases.

### Is OBIS free?

OBIS is free to download, with no in-app purchases.

### Do ERLUS Profi or OBIS have ads?

Neither ERLUS Profi nor OBIS shows ads.

### Which is updated more often, ERLUS Profi or OBIS?

ERLUS Profi ships an update every 4 months, and OBIS every 3 months. Most recently, ERLUS Profi was updated on November 1, 2026 and OBIS on October 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*